> Here's some benchmarking results I did a while back on a single 64-way
> (SMT) POWER6 box.

Very nice numbers! I'd love to test it out here on some real codes,
like Gromacs or NAMD (NAMD I know does a lot of comms and is latency
sensitive), but my Copious Free Time(tm) appears to have run out for the
moment. :-(